The 5140-B7A2PL is a 40-way 0.100 x 0.100-inch Polarized Boardmount Socket with gold-plated copper alloy contacts and through hole termination. This 5100 series socket is glass filled polyester (PBT) insulated, mates with standard low profile shrouded headers, centerbump polarization and gold flash right-angled solder tails.